Enables GTPase activator activity and small GTPase binding activity. Involved in positive regulation of GTPase activity. Predicted to be located in mitochondrion; neuron projection; and plasma membrane. Predicted to be active in membrane. Used to study microphthalmia. Human ortholog(s) of this gene implicated in pancreatic adenocarcinoma. Orthologous to human RALBP1 (ralA binding protein 1). [provided by Alliance of Genome Resources, Apr 2022]